Walkthrough for Doom (2016) Part 22: Accessing the Helix Stone, including secrets, collectibles, and boss fight strategies for the Cyberdemon.
Walkthrough
- 1Enter access tunnels (SECRET 9.3) and find the "Olivia Pierce Model, Eliteguy" collectible and a Mega-Health. Consider using Rich Get Richer for upgrades.
- 2Press the screen as indicated by the waypoint to enter the Lazarus Archives.
- 3In the circular archive room, find SECRET 9.6, COLLECTIBLE 9.2 "Samuel Hayden Model, Toxicguy" behind a red display screen on the upper floor.
- 4In the anteroom to Olivia's Lab, find CODEX ENTRY "UAC Personnel / Olivia Pierce".
- 5In Olivia's Private Lab, interact with a screen after grabbing BFG Ammo, a Munitions Crate, and ARGENT CELL 9.1. Interact with a dilapidated computer to get the Combat Challenge "Demon Destruction".
- 6Return to the circular archive room for Mission 9: Fight: Circular Archive Room, facing endless Imps, Hell Knights, a Mancubus, and Cacodaemons.
- 7After the fight, a circular stairway descends.
- 8Proceed to Mission 9: Fight: Small fight in Bloody Temple / Pew Area, clearing Possessed Securities and The Possesseds. Armor is available behind you.
- 9Enter Mission 9: Circular Hatch Room. Look right for a Lever to access a Classic Map. Jump into the pit (SECRET 9.7) to get ELITE GUARD 9.3 and SECRET 9.8, CLASSIC MAP 8.1 "Doom - Tower of Babel".
- 10Jump back out and interact with the "Cycle Hatch" waypoint. Jump onto the platform to be lifted up.
- 11Drop down and enter the "Maintenance Only" door for Mission 9: Fight: Server Hall, fighting Possessed Securities, a Pinkie, and more The Possesseds.
- 12Continue through the increasingly bloody hallway to Mission 9: Server Hall. Interact with the energy refractor control terminal to open twin doors.
- 13Enter Mission 9: Fight: Two-Level Lounges, fighting Imps, Possessed Soldiers, and The Possessed.
- 14After clearing the area, find a bloody duct in the upper-floor lounge on the right to access SECRET 9.9, RUNE CHALLENGE 9.2, "Saving Throw". Find ELITE GUARD 9.4 nearby.
- 15Proceed to the large silo for Mission 9: Portal Area Fight. Enter the narrow hallway and teleporter.
- 16Before teleporting, equip In-Flight Mobility. Enter the teleporter and immediately jump back to land on a shelf. Use the BFG for the "Thread The Needle" Combat Challenge.
- 17Use the Plasma Gun / Heat Blast and grab the Haste Powerup. Use another BFG if needed. Grab the Quad Powerup when Pinkies or Hell Knights appear.
- 18Follow waypoints for Mission 9: Prepare for Boss fight, grabbing supplies and CODEX ENTRY "Monsters / Cyberdemon". You will receive 6 bonus Weapon Upgrade Points.
- 19Prepare for Mission 9: Boss Fight, part 1: Mars against the Cyberdemon.
Tips
- The "Rich Get Richer" Rune can be upgraded cheaply by repeatedly picking up the Mega-Health in the backstage area and dying to reset the checkpoint.
- For the Portal Area Fight, using the BFG from the shelf after the teleporter is an effective strategy for the "Thread The Needle" Combat Challenge and the fight itself.
- The Cyberdemon's Rockets can be avoided by continuous movement.
- The Cyberdemon's Charge attack requires a quick jump to evade.
- The Jumpable Laser Shot must be jumped over to avoid significant damage.
- Collectibles: "Olivia Pierce Model, Eliteguy", "Samuel Hayden Model, Toxicguy", ELITE GUARD 9.3, ELITE GUARD 9.4.
- Secrets: SECRET 9.3, SECRET 9.6, SECRET 9.7, SECRET 9.8, SECRET 9.9.
- Codex Entries: "UAC Personnel / Olivia Pierce", "Monsters / Cyberdemon".
- Argent Cell: ARGENT CELL 9.1.
- Rune Challenge: RUNE CHALLENGE 9.2, "Saving Throw".
- Classic Map: CLASSIC MAP 8.1 "Doom - Tower of Babel".
- Combat Challenges: "Demon Destruction", "Thread The Needle".
- Weapon Upgrade Points: 6 bonus points before the Cyberdemon boss fight.
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